Mining-drill.



G. W. NIXUN,

MINING DRILL.

APPLIGATION FILED APR. ze. 1909.

953,855B l Patented Apr. 5, w10.

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G. W. NIKON.

MINING DRILL.

APPLICATION FILED APR. ze. 1909.

Patented Apr. 5, 1910.

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git trahit GEORGE W. NIXON, OF CIAT'IANGOG-A., TENNESSEE, ASSIGNOR T0 NIXQN MINING DRILL CG., INCORPGRATED, GF GHATTANGGGA, TENNESSEE.

MINNG-BELL.

T o all 'whom it may concern.:

Be it known that i, Gnoncr. W. Nixon, residing at Chattanooga, in the county ol; fla-milton and State ot Tennessee, have invented certain new a ndnseiul improvements in hiiiiii1g-Drills, of which the following is a specitication.

My present invention, which is designeifl particularly for light mine work where the material to be bored is not ot excessive or continued hardness, is a drill of the duplex ratchet type such as is disclosed in my copending application tiled on even date herewith Serial No. 492Ay l. ln this type ot drill, a main ratchet and pawl mechanism turns the bit while another ratchet and pawl mechanism serves to feed the drill to its work.

ln the drill oit this application as well as that of my co-pending application above referred to, l provide a single lever to actuate the pawls and providemeans whereby the feed may be varied to suit the requirements o'lE the material being worked upon, as it is evident that the bit should not be advanced as tast when the material is hard, as when it soft.

It is the primary object of my present invention to provide a drill embodying a single operating lever for turning and feeding the bit, but of a modified or different construction from that disclosed in my co-pending application above referred to, and one dcsigned tor a special use, to wit-:mlight work.

in carrying ont my present invention, l provide a socket piece to fit on the nonthreaded end ot a screw bar and provide it with a bit shank holding chuck to receive the shank oi a bit. The socket piece is turned on the screw bar by a ratchet gear and a gear pawl actuated by the operating handle, while the screw bar is turned in a tixedly held thread box by a ratchet and pawl device also operated by the handle or operating lever.

Those special details of construction and novel arrangement oli parts lwreinaitter described and specifically pointed out in the appended claims also constitnte a part oit my present invention.

in the drawings, Figure l, is a plan view of my invention. Fig'. 2, is an enlarged central section and part ele Yation thereot, the bit being omitted and the screw bar be ingl broken away. Fig. 3, is ay cross section Specification of Letters Eatent.

Application filed. April 26, 1989.

Entente@ Apr. 5, tte".

Serial No. 492,245.

on the line 3-3 of Fig. 2. Fig. el, is a section on the line ot Fig. 2. i ig, 5 is a similar view on the line of Fig. 2. Fig. (l, is a similar view on the line G-(S of Fig. 7, is a detail perspective view ot the eed pa 'l.

Referring new to the accompanying drawings, in which like letters and numerals of reference indicate like parts in all ot the figures, l designates the socket piece which is bored torreceive the non-threaded end 1.9 oit the screw bar 1G, the socket piece 1 havingthe chuck or bit holding portion 2 to receive the bit. A web or wall (i separates the bit receiving space of the chuck 2 from the bore ot the socket piece. A hard liber washer 22, or other suitable wear absorbing` d vice is interposed between the web (l and the non-threaded portion 19 ot the screw bar to take np the wear duc to end thrust.

The socket piece l has bearing surfaces 3 and el respectively, to receive the forked bearings 9 and ll respectively, oi the operating lever l0, a threaded surface joining the bearing portions 3 and eof the socket piece l, as shown, to receive the main ratchet gear T, which is threaded onto the socket piece l and held between the forked bearing portions S) and ll of the lever l0. rEhe lever 10 is chambered as at l2 to receive the pawl pinion 8, which is adapted to engage with a rack portion 13 on the lever to operatively connect the lever lO and the main ratchet gear 7 together when the lever is moving in one direction, rThe lever l0 has an exten sion le which is socketed as at l5 to receive the pawl carrier that carries the pawl 2.7 which cooperates with the ieed ratchet 18 that is formed, or carried on the screw bar lll to turn therewith.

rlhe pawl carrier has a series of apertures 2G to receive stop pins 230, tor a purpose hereinatter apparent, and it also has another aperture to receive a pivot pin 2st on which the pawl is pivoted. The pawl has a socket to receiv a coil spring 27 to normally hold the linger 2S ot the pawl in engagement with the ratchet. 1S. rihe pawl is also provided with a thumb piece 26 by means of which the finger 2S ot the pawl may be held ont of engagement with the ratchet i8 when desired.

rPhe screw' bar 1G is threaded into a relatively iixedly held thread box 3l., and is also provided with a wrench receiving member on the bac stroke of the handle and so give theI screw be tnriicd in setting up the drill. The nouy tlireaded portion 1S) ot' the screiv bar 16 has lf an annular groove 2O to i'eceive a stop bolt 21 that threads through an aperture in the ivrll of the socket piece 1, and prevents lonie screiv bar.

Qperation: The handle 10 being pulled forwardly. the inain ratchet T, which is screived rigidly on the socket piecel, revolves such socket piece 1, together ivith the bit in the hole. The bit 32 is revolved the full of the motion given the handle 10. The feed is operated only such propertioii ofthe full stroke as may be desired. lo accomplish this result, the cotter set pin 30 is placed in the forivard hole 2f) c. that hole nearest the pai'vl Q5) in the pa\vl carri xr Q3, fol tl i 1 speed. rEhe cotter set pin 30 is placed in the rear holeQf), (2'. c. that hole 29 farthest from the paivl for the sloivest speed. rlhus ivhen the eotter setpin P30 is in the forivard hole, the handle 10 vvill g the paivl Q5 back the same peripheral distancefas the mainpaivl pinion 8 takes on the main ratchet 7, thns feeding the full number threads per inch, sav three v ds per inch, or when the cotter set pin 3C in the last holel it may not be touched no reed at all to the bit. Tillien the feed ratchet QS. ivhich is rigidly screived ou the screv; bar 16, is revolved it carries ivith it bar. evolving the screiv bar 1o in the thread box feeds the screw bar t'orvrard and ivitliit the socket. piece 1 and the hit 32 fixed herein. rl`he feed ratchetl 1S is made long enough to have a hole in its rear portion 17 large enough to admit the small end of a ivrench or i'od for ilse in revolvingI the screiv bar indepenoently.

rlllie scope ot this machine covers all vvork al mining, in rooms` and taking slate. top and bottom. For boring;l holes in coal it ivill Work as rapidly as the regular breast auger. @lts by tightening the set screiv 21 and placing 1 a crank on the squared end 3lof the screiv bar 1G, ivlien the hole `may be bored in at three revolutions per inch (the pitch of the thread being per inch). ln this case, the

ratchet lever 10 ivill stand still by its oivn i Weight, the ratchet ivheel T and ratchet 1S turning the paivl pinion 8 and paivl 25. dinarily the miner ivill tnrn the crank at itudinal movement of the socket piece on most rapid feed is accomplished the rate of tiventytive revolutions per minnte. rit this rate. he ivonld bore the hole at the rate of 8,1,- inches per iiiinnte, or bore up a tivo foot bit in less than tive minntes. By 1 inches or feed ratchet 1S at three notches and the main 1.7. by means of vvhich the screiv bar 16 may f' loosening the set screiv Q1 and setting the set pin '30 for four notches With the stroke attive notches, t-lie feed ivould be l of four 331,- inches per minute. lith the ratchet. T at full stroke of tive notches, the feed would be of toni' inches or 2% inches per minute. Using ttvo notches of the feed ratchet 1S to full stroke of main ratchet 7, the feed vvould be of l or 12- inches per minute. Likewise With one notch of feed ratchet 1S to tive ot the main ratchet T, the feed would be of l or of an inch per minute. rhe latter corresponds to a screw bar of l5 threads per inch, and ivill enable the operator to bore the hardest slate encountered in coal mining operations. This feed, will in fact, cut many varieties of rock and hard iron ore.

lt rom the foregoing description taken in connection ivith the accompanying' draiv ings it thought the complete construction. operation and advantages of my invention ivill be readily apparentto those skilled in the art to ivhich it appertains.

Tilliat I claim is:

1. ln a mining drill. a drill carrying socket piece and a member on which said socket piece is rotatably mounted, means for turning said socket piece on said member, said means comprising a gear on said socket piece,

a lever rotatably moniited on said socket piece and having a chamber, a paivl pinion inclosed Within said chamber, and means fixed to the lever for locking said paivl pin-v ion and lever together when the lever moved in one direction and to be disengaged by said paivl pinion when the lever is moved in an opposite direction.

ln a mining drill, a rotatably mounted member having external bearing surfaces and an intermediate gear receiving surface, a gear mounted on said rotatable member at` said gear receiving surface to turn ivitli said rotatable member, an operating lever straddling said gear and having bearings for said rotatable member. said operating lev r having a chamber and having a toothed portion in said chamber. a pinion loosely mounted in and inclosed by said chamber to engage said toothed portion when. the lever moved vin one direction and to disengage said toothed portion ivhen the lever is moved in an opposite direction to produce intermittent rotary motion in said rotatable member by the reciprocating motion of said lever.

GERGE lV. NX s". lWitnesses lV. PoLLARD, 1V. A. KELLY. 

